<template>
  <!-- 输入框 -->
  <header class="header">
    <h1>小黑记事本</h1>
    <input
        @keyup.enter="handleAdd"
        v-model="todoName" placeholder="请输入任务" class="new-todo" />
    <button @click="handleAdd" class="add noteButton">添加任务</button>
  </header>
</template>
<script >
export default {
  data () {
    return {
      todoName: '',
    }
  },
  methods: {
    handleAdd() {
      if (this.todoName.trim() === ''){
        alert("任务名称不能为空")
        return
      }
      this.$emit('add',this.todoName)
      this.todoName = ''
    }
  }
}
</script>
<style scoped>

</style>
